authorized flac/mp3 streaming command with 50% vol
./Library/Frameworks/GStreamer.framework/Versions/1.0/bin/gst-launch-1.0 souphttpsrc location="https://example.tld/v1/stream/YjEyMDA1NDAtYzNlZS00NmQ2LTg2OTEtOTlkMjAyYjU2NGIy" extra-headers="test, Authorization=(string)\"<ACCESS_TOKEN>\"" ! decodebin ! audioconvert ! audioresample ! volume volume=0.5 ! autoaudiosink